Molding-press



PatentedAug. 30,1921.

llllll P., J. AND A. lL. POMON.

MOLDING PRESS. APPLICATION FILE!) DEC. 26, l9l9.

Fly. l Y

UNITEn. sTATEs PATENT fori-ICEY` i PIERRE PoM'oNgjJosErH roMEoN, AND ANTOINE LEON roMEoN, 0E s'r. CHAMOND, l f FRANCE. v

i MoLnrNG- PREss To @ZZ wwmmay concern: Y

` lBe it known that we, PIERRE PoMEoN, Jo-

y SEPH FoMoN, and ANTOINE LEON PoMoN,

citizens of the French Republic, of StQChamond, Loire, France,haveinvented certain new and useful Improvements in Molding- Presses, of which the following is a specification. n j

This invention relates to apparatus yfor molding boxes and other hollow articles having ribs or beads formed thereon or therein,y

I the material used being'cardboard or other Figs. 2, 3, and `leshow the lower part of the mandrel in the matrix, at different stages of the operation, these views being likewise partly in section.

Figs. 5 and 6 illustrate a modificationfor producing an internalrib.

In the drawing, a designates the matrix or die, and m a hollow body or shell of a plunger, which partly incloses two concentric piston-like plunger elements and c, projecting from the orifice of said shell, the part c being within the part b and having limited independent movement. Both these plunger elements Z and 0 are thrustdownward by a strong coiled spring 1 within the part m, the said spring bearing against a plate aZ which rests upon a ring of balls c seated in a V- shaped channel formed by converging bevels z' and of the parts and 0. The downward movement of the part 'b in the part m, is limited by studs or stops 71. screwed into the part m and projecting into a cavity bn in the part t. The downward movement of` the part c is limited byfa screw 7c screwed into the top of this part, with the smooth part of its shank passing through the plate d and its head j forming a stop over the said plate.

The part c is stepped, and the interior of the part b is likewise stepped, to fit thereon in the manner shown in Figs. 3 and 4. Ex-

lternally the lower part of the shell fm, is

it-can enter the cavity Y Specification of Letters Patent. Patented Aug, 30, `192,1, bpapplicauon .fili-.aY Deeemberlza 1919. serial No. 347,416.

slightly turned down tomake a constriction m1 whose diameter is equalto the internall diameter of the box, the shoulder fm2 being equal to the thickness of the cardboard.

Below this constriction m1 the protruding part of the plunger element b has an enlargement b1 of the same diameter as the constriction. Vhen the parts m1 and b1 meet, as shown in Fig. 4, their combined height is equal to the height of the boxwall, measured from the upper surface of the box floor, and the joint between themis at thelevel of the upper rib. Below the part b1 the plunger element c has a foot clv of such diameter that at thebottom of the part b1. Y 1

. It will be seen that the shell m and parts Z9 and c form in conjunction a telescopic plunger. Vhen the parts b and c are thrust outof the shell by the spring r to the fullest extent allowed by the stops rit and j, as shown in Fig. l, there is, a gap Ai between the parts m1 and b1, and a gap B between the part b1 and the lower edge of the part c1.

vThe matrix or die a has a cylindrical cavity, with two circular grooves or channels g and g1 formed in the wall thereof. A shallowdepresion Z is formed Varound the rim of this cavity. n

For making a cardboard box a disk of cardboard is laid upon the matrix, with its rim inthe depression Z, and the plunger, in the extended state shown in Fig. 1, is brought down upon this disk and forced into the matrix swaging or molding the blank with the shape of a cylindrical box in the manner shown in Fig. 2. The spring a" is sulliciently powerful to keep the parts b and c extended until the foot 01 has thrust the.

blank againstthe floor of the matrix. The downward movement of the part c being then arrested, the continued downward. thrust exerted on the plunger causes the plate d, bearing on the balls e, to push down the partit vover the part c, and the shoulder m2, acting on the rim of the box, push the box wall downward, so that the rounded part C (Fig. 2) joining the wall to the bottom of the box is forced or extruded into the groove g and forms a rib l, as shown in Fig. 3. At this stage the downward movement of the part b is arrested, but the shell m continues to descend until it meets the part b1, and by this means the part D (Fig. 3) of the box wall is forced or extruded into the groove g1, to form a rib 2, as shown in F ig. 4.

` The plunger is then'witlidrawn from the matrix, and the latter, which is made in two parts with a hinge, in the usual manner, is opened to enable the box to be taken out. It will be obvious that by providing ad-1 ditional plunger elements in series, with gaps such as the gap A in Fig. 1,*and.-

using a matrix or die with additional grooves, ya hollow article having any desired number of ribs can be made.'` Toproduce an internal rib, as shown at 3 in Fig. 6, by means of a plunger operating` in the same manner, the wall of the matrix is left smooth, as shown at am in F ig. 5, but the rims of two consecutive plunger elements m1 and Zim are beveled, as shownat g2, so that when these two elements meet they will leave a circular` cavity into which'a portion of the blank is forced, to form the rib. This arrangement may be used in conjunction with an arrangement Such as shown in Figs. Vl to 4l, so that a hollow article is produced having both internal and external ribs.

That we claim as our invention and desire to secure by Letters Patent of the United States is l. In a molding or swagingpress the combination of a matrix, and a plunger adapted to enter said matrix, the said lunger comprising a shell having an ori ce, a piston-like member which is guided in said shell and has an enlargement outside said orifice, and `elastic means in said shell acting to maintain said piston in projected relation to said shellwith al gap between said enlargement and the rim of'said orifice, and permitting said enlargement to be forced r.toward said rim during the pressing operaation, for the purposeA specified.

2. Ina Vmolding or swaging press, the combination of a grooved matrix and a telescopic plunger adapted .to enter said matrix, said plunger and matrix forming inconjunction a mold having a -wall parallel with theplunger movement, and said plunger having a shoulder which closes said mold, the said plunger comprising a shell, two members axiallyand 'independently slidable in said shell, one withingthe other, said slidable members having converging beveled edges within said shell forming in conjunction a channel, ballsfdisposed in said channel, a plate resting on said balls, a spring bearing on said plate tending to thrust said slidable membersl out of said shell, and means limiting the outward move' ment of each of said slidable members allowing one of said members to issue farther than the other, for the purposespecified.

In witness whereof we have signed thisu specication in the presence of two witnesses. Y

PIERRE POM'EON.VV JOSEPH POMEON. ANTOINE LEON POMEONk Witnesses:

CARADIST,

MONTEBRA. 

